Ball valve



FIG. 1 is a front elevational view of a ball valve embodying the designof the present invention;

FIG. 2 is a back elevation view of the ball valve of FIG. 1;

FIG. 3 is a left-hand side elevation view of the ball valve of FIG. 1;

FIG. 4 is a right-hand side elevationaview of the ball valve of FIG. 1;

FIG. 5 is a bottom elevation view of the ball valve of FIG. 1; and,

FIG. 6 is a top elevation view of the ball valve of FIG. 1.

The ornamental design for a ball valve, as shown and described.